1、A.E.C.M.A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM Edition approved for publication 22 April 1986 prEN29 14 Issue P 1 April 1986 Comments should be sent within six months c3 Chairman after the date of publication decision 88. Bd. Malesherbes A.E.C.M.A. Mr ARENA 75008 PARIS - FRANCE ENGLISH VERSION
2、 Aerospace series Washers, flat, large diameter heat resisting steel Srie arospatiale Rondelles plates larges, en acier rsistant chaud Luft- und Raumfahrt Scheiben, angesenkt, groper Aupendurchmesser aus hochwarmfestem Stahl This standard is initially published on green paper for the needs of AECMA-
3、Members (Association Europenne des Constructeurs de Matriel Arospatial). It has been technically approved by the experts of the concerned AECMA Commission following comment by the manufacturers of the Member countries. After examination and signature of the AECMA Standard Checking Centre (NPS) and f
4、ornial agreement of the Official Services of the Member countries it will be published ih its final version on yellow paper as an AECMA Standard. - ! AECPIA PREN2934 b 3OL231iL 0004435 5 m- prEN2914 Page 3 I Scope and field of application This standard specifies the characteristics of flat heat resi
5、sting steel washers with a large outside diameter (3 X inside diameter approx.) for use in aerospace applications, at temperatures below 650 OC. They are intended for use with soft materials to spread the bearing loads, and avoid surface damage. 2 References EN2171 EN21 75 EN2424 EN251 6 , Heat resi
6、sting steel FE-PA92HT - Rm 2 900 MPa - Bars - Aerospace series , Heat resisting steel FE-PA93HT, solution treated and precipitation treated - Sheets , Identification marking of standard fasteners - Aerospace series , Aerospace series Passivation of corrosion resisting steels I) and strips a 3 mm - A
7、erospace series 3 Required characteristics 3.1 Configuration - Dimensions - Tolerances Configuration shall correspond with the figure ; dimensions and tolerances shall correspond to figure and table after passivation. 3.2 Surface roughness The values shown in the figure apply prior to passivation. 3
8、3 Materials Heat resisting steel EN2171 or EN2175. 3.4 Surface treatment Passivation EN251 6 1) In preparation. I AECDA PREN2914 86 lBL23LL 0004436 7 BI 120 1 prEN2914 Page 4 s 1) Thickness -r 10% code Diameter code Mass kg/l O00 pieces approx. 2) 030 040 dl HI3 050 d2 hl 4 060 1 O, 6 06 1 10 O, 6
9、06 1 10 1 10 1,6 16 12 12 ,070 080 0,26 0,44 0,47 0,78 1,22 1,95 2,ll 1 O0 1,6 16 I 2,81 O u) O o. a +I 3,2 42 52 Figure - Configuration Table - Dimensions and tolerances 9 I 3,8 12 4,8 15 6 Dimensions in millimeters 1 18 I 6,2 Break all corners 0.1 to 0,2 mm 7,4 72 82 10.2 12,2 21 8,4 24 9,4 I 30 1
10、1,6 36 13,8 12 1,6 1,6 23 2 2,s 2 2,5 d3 12 2,78 16 3,71 16 5,02 25 7,85 20 9,81 25 12,3 20 14,14 25 17,7 +o, 1 O +0,2 O +0,3 O 7) Flatness variations are included in the thickness tolerance. 2) Calculated on the basis of 7,85 kg/dm3. I I prEN2914 Page 5 4 Designation Each washer shall only be desig
11、nated as in the following example : Description block :. - . Identity block WASHER I EN2,!314-002 20 =thickness code (see table) 3 Number of EN standard 080 = diameter code (see table) Note : if necessary, the originator code S9005 may be introduced between the description block and the identity block. 5 Marking EN2424, style G. In addition o the quantity shall be stated (Mass or number).
